One vertex per element, one color per generator, with an edge from x to x·s.
(2,8)(5,6)(9,22)(10,23)(11,12)(13,26)(15,20)(17,25)(18,21)(24,28)(27,32)(29,30)(33,34)(35,40)(36,48)(37,42)(38,51)(39,43)(41,49)(44,58)(45,54)(46,55)(47,61)(50,56)(52,57)(53,59)(60,63)(62,64) involution — undirected(1,2,7,12)(3,13,16,9)(4,17,19,23)(5,8,6,11)(10,21,25,18)(14,28,31,32)(15,22,20,26)(24,30,27,29)(33,35)(34,40)(36,44)(37,45)(38,47)(39,46)(41,53)(42,54)(43,55)(48,58)(49,59)(50,60)(51,61)(52,62)(56,63)(57,64)(1,3,7,16)(2,9,12,13)(4,14,19,31)(5,20,6,15)(8,22,11,26)(10,24,25,27)(17,32,23,28)(18,30,21,29)(33,36)(34,41)(35,44)(37,49)(38,52)(39,50)(40,53)(42,56)(43,57)(45,59)(46,60)(47,62)(48,51)(54,63)(55,64)(58,61)(1,4)(2,10)(3,14)(5,18)(6,21)(7,19)(8,23)(9,24)(11,17)(12,25)(13,27)(15,29)(16,31)(20,30)(22,28)(26,32)(33,37,39,38)(34,42,43,51)(35,45,46,47)(36,49,50,52)(40,54,55,61)(41,56,57,48)(44,59,60,62)(53,63,64,58)(1,5,7,6)(2,11,12,8)(3,15,16,20)(4,18,19,21)(9,22,13,26)(10,17,25,23)(14,29,31,30)(24,28,27,32)(35,46)(40,55)(44,60)(45,47)(53,64)(54,61)(58,63)(59,62)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.